Universiti Teknologi Malaysia Institutional Repository

Pre-processing of input features using LPC and warping process

Sudirman, Rubita and Sh-Hussain, Salleh and Ming, Ting Chee (2005) Pre-processing of input features using LPC and warping process. 1st Conference on Computers, Commmunications, and Signal Processing . pp. 300-303. ISSN 1-4244-0012-0



This paper presents pre-processing of input features to artificial neural network (NN). This is for preparation of reliable reference templates for the set of words to be recognized. The first task is to extract pitch features using Pitch Scale Harmonic Filter (PSHF) algorithm. Another task is to align the input frames (test set) to the reference template (training set) using a modified DTW algorithm called DTW fixing frame (DTW-FF)algorithm. This proper time normalization is needed since NN is designed to compare data of the same length; same speech can varies in their duration. By performing frame fixing or time normalization, the test set and the training set is adjusted to a fix number of frames throughout the sets utilizing the local distance score of the matched features. Then those features can be adapted to NN for further recognition tuning.

Item Type:Article
Uncontrolled Keywords:dynamic time warping, speech recognition, linear predictive
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:1574
Deposited By: Dr Zaharuddin Mohamed
Deposited On:08 Mar 2007 03:01
Last Modified:05 Jan 2012 02:18

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